Difficult Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 13: Six Difficult (DiffLev 9-11) tpsmith-surprised Puzzles (numbers 97-102) 
 
-  Step-by-step instructions for solving  Puzzle 97, (85/144)   Diff: 9/9.9999.5653
 -  Step-by-step instructions for solving  Puzzle 98, (84/144)   Diff: 10/99.8999.5972
 -  Step-by-step instructions for solving  Puzzle 99, (87/144)   Diff: 10/98.9868.9992
 -  Step-by-step instructions for solving  Puzzle 100, (90/144)   Diff: 10/98.7988.8993
 -  Step-by-step instructions for solving  Puzzle 101, (93/144)   Diff: 11/796.4589.9988
 -  Step-by-step instructions for solving  Puzzle 102, (96/144)   Diff: 11/986.6866.9992